Digestion system Flashcards
two parts of nutrition
ingestion and digestion
ingestion
taking food into the digestive system
digestion
breakdown of food in order to utolize nutrients
types of nutrients
micro and macro
types of nutrients
micro and macro
micronutrients
vitamins minerals and water
macronutrients
proteins lipids and carbohydrates
What are the two tupes of digestion
mechanical and chemical
mechanical digestion in the mouth
the teeth breaking down food
chemical digestion in the mounth
saliva digesting starch
amylase
saliva, that breaks starches into glucose monomers
Mucin
slippery protein that protects the soft lining of the digestive system; lubricates food for easier swallowing
buffers
neutralize acid to prevent tooth decay
anti-bacteriel chemicals
kill bacteriea hat enter the mouth with food
parts of tooth
crown, root, enamil, dentin and pulp
crown
part of the tooth above the gum
root
part of the tooth below the gum
enamil
calcium salt
dentin
bone like enamel; hardest substance in the body
bolus
lump formed with food and saliva
Epiglottis
flap of cartilage that closes the trachea when swallowing
where does food leave the mouth
through the esophagus
peristalsis
involuntary muscle contractions that move food along
pharynx
region in the back of the throught that connects to the larynx and the esophagus
how long is the pharynx
about 15 cm
how long is the pharynx
about 15 cm
digestive glands
groups of specialized secretory cells
where are difestive glands found
the lining of the alimentary canal or accessory organs
segmentation
involuntary contractions for the mixing of food
layers of the alimentary canal
mucosa, submuosa, muscular layer and serosa
Mucosal layer
inner most layer, secretes mucus
submuosal layer
provides elacticity of the tube; contains blood vessels
muscular layer
smooth muscle tissue, circular + longitudinal fibrs that pushes and mixes food
serosa (serous layer)
Visceral peritoneum, outercovering of the tube that moistens and lubricates structures.
Esophageal Hiatus
where the esophagus penatrates the diapram,
where does the esophagus connect to the stomach
at the cardiac sphincter
function of the stomach
temporary food storage/ mechanically and chemically breaks food down into chyme
function of the stomach
temporary food storage/ mechanically and chemically breaks food down into chyme
where does chymeleave the stomach
the pyloric sphincter
regions of the stomach
cardiac, fundic, body (greater and lesser curvature) and pyloric
stomach functions
food storage, dinfect food, and chemical digestion
pepsin
enzyme in stomach that breaks down protiens
Omentum
large apron like fold of visceral peritonium that hangs from the greater andd lesser curvature
accesory organs
pancreas, gallbladder, liver and salivary glands